18 THE FLORIDA ENTOMOLOGIST 
a strong movement is on foot to bring about such a system of 
irrigation and no doubt in a few years not only will the present 
groves be irrigated by the gravity system but also great acre- 
ages in addition. So far as I could learn the cost of irrigating 
a grove varies from $10.00 to $12.00 per acre per year. No doubt 
the cost is different in different districts. Since the valley is 
near Mexico an abundant supply of labor is always available 
and the prevailing wage is one dollar per day for common labor. 
Extent of Industry. According to the best information obtain- 
able, 1,700,000 citrus trees have been planted during the past 
few years. This would be about 25,000 acres figuring on the 
basis that the trees were planted 20x20 feet. As yet the produc- 
tion of fruit has not been great but prospects are good for 
ten or twelve thousand cars within the period of 4 years. In 
fact this is the estimate given by the president of the Valley 
Citrus Exchange. 
Varieties and Root Stocks. The Parson Brown, Pineapple 
and Valencias seem to be the varieties of oranges usually planted, 
while Duncan and Marsh Seedless were the leading varieties of 
grapefruit, 80% of the plantings consisting of grapefruit and 
only 20% of oranges. With one exception all of the citrus 
growers with whom I talked in the Valley are of the opinion 
that neither trifoliata nor lemon stock have any value for the 
growing of citrus trees in the Valley. Practically all the plant- 
ings are now on sour orange stock. 
Injury from Winds. The injury caused by the winds is very 
great. A large part of the foliage on young trees is blown away 
and most of these trees are very much lop-sided. The foliage 
on the outside rows on the south and east sides of most groves 
is usually very sparse, due to the injury from winds. The fruit 
also is very badly blemished by being blown around so violently 
as to cause mechanical injury. In fact I rather thought that 
99% of the blemishes seen in the Valley were caused by winds. 
Diseases. Although an extensive search was made for mela- 
nose not a single spot was found in the entire Valley. Citrus 
scab was very serious on some sour seedlings in a nursery but 
the grapefruit trees did not seem to be seriously effected with 
this fungus disease. In one grove I saw what I presumed to 
be foot-rot and one case of a disease simliar to frenching was 
observed. 
Insects and Mites. Since citrus trees have been shipped into 
the Valley from both Florida and California is is only natural 
